forked from OSchip/llvm-project
[ADT] Adopt the new casting infrastructure for PointerUnion
Reviewed By: lattner, bzcheeseman Differential Revision: https://reviews.llvm.org/D125609
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Sheng
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@ -18,6 +18,7 @@
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#include "llvm/ADT/DenseMapInfo.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/PointerLikeTypeTraits.h"
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#include <algorithm>
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#include <cassert>
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@ -87,6 +88,9 @@ namespace pointer_union_detail {
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};
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}
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// This is a forward declaration of CastInfoPointerUnionImpl
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// Refer to its definition below for further details
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template <typename... PTs> struct CastInfoPointerUnionImpl;
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/// A discriminated union of two or more pointer types, with the discriminator
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/// in the low bit of the pointer.
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///
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@ -122,6 +126,11 @@ class PointerUnion
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using First = TypeAtIndex<0, PTs...>;
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using Base = typename PointerUnion::PointerUnionMembers;
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/// This is needed to give the CastInfo implementation below access
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/// to protected members.
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/// Refer to its definition for further details.
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friend struct CastInfoPointerUnionImpl<PTs...>;
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public:
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PointerUnion() = default;
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@ -134,25 +143,24 @@ public:
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explicit operator bool() const { return !isNull(); }
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// FIXME: Replace the uses of is(), get() and dyn_cast() with
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// isa<T>, cast<T> and the llvm::dyn_cast<T>
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/// Test if the Union currently holds the type matching T.
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template <typename T> bool is() const {
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return this->Val.getInt() == FirstIndexOfType<T, PTs...>::value;
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}
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template <typename T> inline bool is() const { return isa<T>(*this); }
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/// Returns the value of the specified pointer type.
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///
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/// If the specified pointer type is incorrect, assert.
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template <typename T> T get() const {
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assert(is<T>() && "Invalid accessor called");
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return PointerLikeTypeTraits<T>::getFromVoidPointer(this->Val.getPointer());
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template <typename T> inline T get() const {
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assert(isa<T>(*this) && "Invalid accessor called");
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return cast<T>(*this);
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}
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/// Returns the current pointer if it is of the specified pointer type,
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/// otherwise returns null.
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template <typename T> T dyn_cast() const {
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if (is<T>())
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return get<T>();
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return T();
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template <typename T> inline T dyn_cast() const {
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return llvm::dyn_cast<T>(*this);
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}
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/// If the union is set to the first pointer type get an address pointing to
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@ -205,6 +213,52 @@ bool operator<(PointerUnion<PTs...> lhs, PointerUnion<PTs...> rhs) {
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return lhs.getOpaqueValue() < rhs.getOpaqueValue();
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}
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/// We can't (at least, at this moment with C++14) declare CastInfo
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/// as a friend of PointerUnion like this:
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/// ```
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/// template<typename To>
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/// friend struct CastInfo<To, PointerUnion<PTs...>>;
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/// ```
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/// The compiler complains 'Partial specialization cannot be declared as a
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/// friend'.
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/// So we define this struct to be a bridge between CastInfo and
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/// PointerUnion.
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template <typename... PTs> struct CastInfoPointerUnionImpl {
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using From = PointerUnion<PTs...>;
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template <typename To> static inline bool isPossible(From &F) {
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return F.Val.getInt() == FirstIndexOfType<To, PTs...>::value;
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}
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template <typename To> static To doCast(From &F) {
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assert(isPossible<To>(F) && "cast to an incompatible type !");
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return PointerLikeTypeTraits<To>::getFromVoidPointer(F.Val.getPointer());
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}
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};
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// Specialization of CastInfo for PointerUnion
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template <typename To, typename... PTs>
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struct CastInfo<To, PointerUnion<PTs...>>
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: public DefaultDoCastIfPossible<To, PointerUnion<PTs...>,
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CastInfo<To, PointerUnion<PTs...>>> {
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using From = PointerUnion<PTs...>;
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using Impl = CastInfoPointerUnionImpl<PTs...>;
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static inline bool isPossible(From &f) {
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return Impl::template isPossible<To>(f);
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}
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static To doCast(From &f) { return Impl::template doCast<To>(f); }
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static inline To castFailed() { return To(); }
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};
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template <typename To, typename... PTs>
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struct CastInfo<To, const PointerUnion<PTs...>>
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: public ConstStrippingForwardingCast<To, const PointerUnion<PTs...>,
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CastInfo<To, PointerUnion<PTs...>>> {
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};
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// Teach SmallPtrSet that PointerUnion is "basically a pointer", that has
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// # low bits available = min(PT1bits,PT2bits)-1.
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template <typename ...PTs>
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@ -156,4 +156,136 @@ TEST_F(PointerUnionTest, GetAddrOfPtr1) {
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EXPECT_TRUE((void *)n.getAddrOfPtr1() == (void *)&n);
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}
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TEST_F(PointerUnionTest, NewCastInfra) {
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// test isa<>
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EXPECT_TRUE(isa<float *>(a));
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EXPECT_TRUE(isa<int *>(b));
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EXPECT_TRUE(isa<int *>(c));
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EXPECT_TRUE(isa<int *>(n));
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EXPECT_TRUE(isa<int *>(i3));
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EXPECT_TRUE(isa<float *>(f3));
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EXPECT_TRUE(isa<long long *>(l3));
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EXPECT_TRUE(isa<int *>(i4));
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EXPECT_TRUE(isa<float *>(f4));
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EXPECT_TRUE(isa<long long *>(l4));
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EXPECT_TRUE(isa<double *>(d4));
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EXPECT_TRUE(isa<int *>(i4null));
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EXPECT_TRUE(isa<float *>(f4null));
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EXPECT_TRUE(isa<long long *>(l4null));
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EXPECT_TRUE(isa<double *>(d4null));
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EXPECT_FALSE(isa<int *>(a));
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EXPECT_FALSE(isa<float *>(b));
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EXPECT_FALSE(isa<float *>(c));
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EXPECT_FALSE(isa<float *>(n));
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EXPECT_FALSE(isa<float *>(i3));
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EXPECT_FALSE(isa<long long *>(i3));
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EXPECT_FALSE(isa<int *>(f3));
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EXPECT_FALSE(isa<long long *>(f3));
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EXPECT_FALSE(isa<int *>(l3));
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EXPECT_FALSE(isa<float *>(l3));
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EXPECT_FALSE(isa<float *>(i4));
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EXPECT_FALSE(isa<long long *>(i4));
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EXPECT_FALSE(isa<double *>(i4));
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EXPECT_FALSE(isa<int *>(f4));
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EXPECT_FALSE(isa<long long *>(f4));
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EXPECT_FALSE(isa<double *>(f4));
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EXPECT_FALSE(isa<int *>(l4));
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EXPECT_FALSE(isa<float *>(l4));
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EXPECT_FALSE(isa<double *>(l4));
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EXPECT_FALSE(isa<int *>(d4));
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EXPECT_FALSE(isa<float *>(d4));
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EXPECT_FALSE(isa<long long *>(d4));
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EXPECT_FALSE(isa<float *>(i4null));
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EXPECT_FALSE(isa<long long *>(i4null));
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EXPECT_FALSE(isa<double *>(i4null));
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EXPECT_FALSE(isa<int *>(f4null));
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EXPECT_FALSE(isa<long long *>(f4null));
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EXPECT_FALSE(isa<double *>(f4null));
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EXPECT_FALSE(isa<int *>(l4null));
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EXPECT_FALSE(isa<float *>(l4null));
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EXPECT_FALSE(isa<double *>(l4null));
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EXPECT_FALSE(isa<int *>(d4null));
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EXPECT_FALSE(isa<float *>(d4null));
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EXPECT_FALSE(isa<long long *>(d4null));
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// test cast<>
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EXPECT_EQ(cast<float *>(a), &f);
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EXPECT_EQ(cast<int *>(b), &i);
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EXPECT_EQ(cast<int *>(c), &i);
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EXPECT_EQ(cast<int *>(i3), &i);
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EXPECT_EQ(cast<float *>(f3), &f);
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EXPECT_EQ(cast<long long *>(l3), &l);
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EXPECT_EQ(cast<int *>(i4), &i);
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EXPECT_EQ(cast<float *>(f4), &f);
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EXPECT_EQ(cast<long long *>(l4), &l);
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EXPECT_EQ(cast<double *>(d4), &d);
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// test dyn_cast
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EXPECT_EQ(dyn_cast<int *>(a), nullptr);
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EXPECT_EQ(dyn_cast<float *>(a), &f);
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EXPECT_EQ(dyn_cast<int *>(b), &i);
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EXPECT_EQ(dyn_cast<float *>(b), nullptr);
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EXPECT_EQ(dyn_cast<int *>(c), &i);
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EXPECT_EQ(dyn_cast<float *>(c), nullptr);
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EXPECT_EQ(dyn_cast<int *>(n), nullptr);
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EXPECT_EQ(dyn_cast<float *>(n), nullptr);
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EXPECT_EQ(dyn_cast<int *>(i3), &i);
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EXPECT_EQ(dyn_cast<float *>(i3), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(i3), nullptr);
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EXPECT_EQ(dyn_cast<int *>(f3), nullptr);
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EXPECT_EQ(dyn_cast<float *>(f3), &f);
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EXPECT_EQ(dyn_cast<long long *>(f3), nullptr);
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EXPECT_EQ(dyn_cast<int *>(l3), nullptr);
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EXPECT_EQ(dyn_cast<float *>(l3), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(l3), &l);
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EXPECT_EQ(dyn_cast<int *>(i4), &i);
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EXPECT_EQ(dyn_cast<float *>(i4), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(i4), nullptr);
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EXPECT_EQ(dyn_cast<double *>(i4), nullptr);
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EXPECT_EQ(dyn_cast<int *>(f4), nullptr);
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EXPECT_EQ(dyn_cast<float *>(f4), &f);
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EXPECT_EQ(dyn_cast<long long *>(f4), nullptr);
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EXPECT_EQ(dyn_cast<double *>(f4), nullptr);
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EXPECT_EQ(dyn_cast<int *>(l4), nullptr);
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EXPECT_EQ(dyn_cast<float *>(l4), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(l4), &l);
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EXPECT_EQ(dyn_cast<double *>(l4), nullptr);
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EXPECT_EQ(dyn_cast<int *>(d4), nullptr);
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EXPECT_EQ(dyn_cast<float *>(d4), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(d4), nullptr);
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EXPECT_EQ(dyn_cast<double *>(d4), &d);
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EXPECT_EQ(dyn_cast<int *>(i4null), nullptr);
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EXPECT_EQ(dyn_cast<float *>(i4null), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(i4null), nullptr);
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EXPECT_EQ(dyn_cast<double *>(i4null), nullptr);
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EXPECT_EQ(dyn_cast<int *>(f4null), nullptr);
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EXPECT_EQ(dyn_cast<float *>(f4null), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(f4null), nullptr);
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EXPECT_EQ(dyn_cast<double *>(f4null), nullptr);
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EXPECT_EQ(dyn_cast<int *>(l4null), nullptr);
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EXPECT_EQ(dyn_cast<float *>(l4null), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(l4null), nullptr);
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EXPECT_EQ(dyn_cast<double *>(l4null), nullptr);
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EXPECT_EQ(dyn_cast<int *>(d4null), nullptr);
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EXPECT_EQ(dyn_cast<float *>(d4null), nullptr);
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EXPECT_EQ(dyn_cast<long long *>(d4null), nullptr);
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EXPECT_EQ(dyn_cast<double *>(d4null), nullptr);
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// test for const
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const PU4 constd4(&d);
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EXPECT_TRUE(isa<double *>(constd4));
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EXPECT_FALSE(isa<int *>(constd4));
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EXPECT_EQ(cast<double *>(constd4), &d);
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EXPECT_EQ(dyn_cast<long long *>(constd4), nullptr);
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auto *result1 = cast<double *>(constd4);
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static_assert(std::is_same<double *, decltype(result1)>::value,
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"type mismatch for cast with PointerUnion");
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PointerUnion<int *, const double *> constd2(&d);
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auto *result2 = cast<const double *>(d);
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static_assert(std::is_same<const double *, decltype(result2)>::value,
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"type mismatch for cast with PointerUnion");
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}
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} // end anonymous namespace
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